An XPS, ISS and ESR Comparative Study of Eight-Coordination of Copper (II) Ions in the CuTho Compounds

Transition-metal borides with the tantalum boride (Ta3B4) crystal structure: their electronic and bonding properties

“…This is in accord with experimental data. [1][2][3] Note the most obvious feature of the Ta3B4 DOS-the boron and tantalum states are not segregated but are mixed over a wide range of energies. Obviously the band structure of Ta3B4 is not simple.…”

“…M3B4 compounds with d6-dX0 metals should be unstable. We think that is the main reason these com- pounds are so far unknown (see Table I), although attempts to obtain them were not abandoned until recently [1][2][3]6,10 same situation exists for the borides MB2 with the A1B2 crystal structure for d5-d10 metals.14…”

“…In Table I we list the currently known wellcharacterized binary TMB. [1][2][3][4][5][6][7][8][9][10][11][12][13] There is a variety of structures in these, boron atoms forming chains, layers, or three-dimensional networks extending throughout the whole crystal. It is this structural richness, achieved by boron-boron bonding, that made us undertake a study of their electronic structure.…”

Stabilization of the Vaterite Structure in the Presence Of Copper(II): Thermodynamic and Spectroscopic Studies

“…Dissolution/Degradation of Copper ≪ Coatings ≫ . Previous works ,,, have shown that information about the chemical environments of Cu(II) present in a crystalline solid matrix can be obtained by using the intensity ratio I sat / I pp [where I sat and I pp are the intensities of the satellite peak and the principal peak, respectively, measured from the XPS spectrum of Cu 2 p 3/2 level of Cu(II)]. Thus, D'Huysser et al have indicated that the I sat / I pp ratio is equal to 0.85 for a Cu(II) with a 4-fold coordination and decreases to 0.55 for a Cu(II) with a 6-fold coordination.…”